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Prepn process of nanometer composite titania/silica photocatalyst sol and transparent photocatalyzing film

A technology of nano-titanium dioxide and composite photocatalysis, applied in chemical instruments and methods, physical/chemical process catalysts, separation methods, etc., can solve environmental protection discounts for water-based environmentally friendly coatings, accelerated aging of paint coatings, poor stability, etc. Problems, to achieve the effect of low price, short operation cycle and convenient operation

Inactive Publication Date: 2007-12-19
TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

It not only increases the cost, but also makes this water-based environmentally friendly coating greatly discounted in terms of environmental protection
And the added organic and polymer additives can be gradually degraded by titanium dioxide, which will accelerate the aging of the paint film and deteriorate the stability
However, some other photocatalytic coatings also have many problems, such as: difficult film formation, difficult loading, serious damage to the substrate, easy aging, poor weather resistance, etc., which limit their application.

Method used

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  • Prepn process of nanometer composite titania/silica photocatalyst sol and transparent photocatalyzing film
  • Prepn process of nanometer composite titania/silica photocatalyst sol and transparent photocatalyzing film
  • Prepn process of nanometer composite titania/silica photocatalyst sol and transparent photocatalyzing film

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Experimental program
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Effect test

Embodiment 1

[0050] Dilute 8ml titanium tetrachloride solution to 1000ml solution under ice-water bath and stirring condition, Ti 4+ The ion concentration is about 0.02mol / L, and the pH value is adjusted to 7 with ammonia water to obtain orthotitanic acid precipitation, which is washed to remove impurities. In this precipitation, add 40ml mass percentage concentration earlier and be 30% hydrogen peroxide solution, treat that after all dissolving, be 30% nitric acid adjustment pH value to be 2, then add 200ml particle diameter and be 8~20nm, The acidic silica aqueous sol with a pH value of less than 3 is refluxed at 100° C. for 3 hours to obtain a light yellow and transparent titanium dioxide / silica composite photocatalytic sol, and the particle size of the composite photocatalytic sol is 15-30 nm.

Embodiment 2

[0052] Mass percent concentration is 80% sulfuric acid heating and melting ilmenite (mass ratio is ilmenite: sulfuric acid = 1: 2), the solid phase deposit obtained is obtained by immersion in water to obtain titanium liquid, and the titanium liquid is filtered to remove insoluble substances , freeze and recrystallize to remove ferrous sulfate by filtration to obtain a titanium-containing solution, Ti 4+ The ion concentration is 0.1-0.2 mol / L; the pH value is adjusted to 7 with ammonia water, and orthotitanic acid is precipitated, washed to remove impurities. Take 100 g of orthotitanic acid precipitate, add 50 ml of distilled water, and then add 200 ml of neutral (pH value of 7) silica aqueous sol with a particle size of 8-20 nm. After mixing evenly, add 40ml of hydrogen peroxide solution with a mass percentage concentration of 30%, and reflux at 80°C for 0.5 hour, 1 hour, and 10 hours respectively to obtain different orange-yellow transparent titanium dioxide / silicon dioxide ...

Embodiment 3

[0054] 100g titanyl sulfate is dissolved in 500ml distilled water to form a titanium-containing solution, Ti 4+ The ion concentration is 0.1~0.3mol / L. Use 1mol / L NaOH solution to adjust the pH value to 7 to obtain orthotitanic acid precipitate, wash to remove impurities. Take 100g of orthotitanic acid precipitate and first add 40ml of hydrogen peroxide solution with a mass percentage concentration of 30%. After it is completely dissolved, adjust the pH value to 8 with dilute ammonia water, and then add 100ml of alkaline silica with a particle size of 8 to 20nm. The sol was refluxed at 90° C. for 6 hours to obtain a light yellow transparent titanium dioxide / silicon dioxide composite photocatalytic sol, and the particle diameter of the composite photocatalytic sol was 15-30 nm.

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Abstract

The present invention belongs to the field of inorganic metal oxide, and is especially process of preparing nanometer titania / silica photocatalyst sol and transparent photocatalyzing film. The anatase type nanometer titania / silica photocatalyst sol is prepared with inorganic low concentration titanium compound solution as material at normal pressure and 40-100 deg.c. The sol has high hydrophilicity, high photocatalyzing activity, high transparency and particle size of 15-30 nm. The sol may be painted onto substrate of different properties to form self-cleaning transparent photocatalyzing film with high hardness and high antifouling and antiseptic performance. The sol has high stability, small and homogeneous size and high performance; and the preparation process has low cost and simple operation and is suitable for large scale production and application.

Description

technical field [0001] The invention belongs to the field of inorganic metal oxides, in particular to a preparation method of nano-titanium dioxide / silicon dioxide composite photocatalytic sol. Background technique [0002] Among many semiconductor materials, titanium dioxide has attracted much attention for its high catalytic activity, good stability, harmlessness to human body, ability to work under normal temperature and pressure, long duration of action, and low price and easy availability. However, ordinary titanium dioxide as a photocatalyst is easy to deactivate, easy to agglomerate, and difficult to recycle in practical applications, so it is difficult to popularize. The preparation of titanium dioxide composite materials makes full use of the functions of titanium dioxide, such as photocatalysis, self-cleaning, light-excited superhydrophilicity, antifouling, and antibacterial, while also combining the advantages of other materials. Therefore, nanoscale titanium dio...

Claims

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Application Information

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IPC IPC(8): B01J21/06B01J21/08B01D53/86
Inventor 只金芳陈妍伶张阳
Owner TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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